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Abstract

Fig. 1 is a functional diagram of a personal computer (PC)-controlled Audio Volume and Mix controller (VMX). D1 through D4, shown in Fig. 1, are digitally-controlled variable attenuation circuits. An implementation is shown in Fig. 2. The 12-bit DAC1230, shown in Fig. 2, provides 72 dB of attenuation, which is adequate for most audio applications. DACs with fewer bits or more bits may be used, depending on the application requirements. S1 and S2, shown in Fig. 1, are summing amplifiers. An implementation example is shown in Fig. 3. (Image Omitted) As shown in Fig. 1, D1 controls the amount of input A that appears in output L (left). D2 controls the amount of input B that appears in output L. D3 and D4 control the amounts of inputs A and B that appear in output R (right).

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English (United States)

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Method to Control Audio Volume and Mix With a Personal Computer

Fig. 1 is a functional diagram of a personal computer (PC)-controlled Audio
Volume and Mix controller (VMX). D1 through D4, shown in Fig. 1, are digitally-
controlled variable attenuation circuits. An implementation is shown in Fig. 2.
The 12-bit DAC1230, shown in Fig. 2, provides 72 dB of attenuation, which is
adequate for most audio applications. DACs with fewer bits or more bits may be
used, depending on the application requirements. S1 and S2, shown in Fig. 1,
are summing amplifiers. An implementation example is shown in Fig. 3.

(Image Omitted)

As shown in Fig. 1, D1 controls the amount of input A that appears in output L
(left). D2 controls the amount of input B that appears in output L. D3 and D4
control the amounts of inputs A and B that appear in output R (right). A PC is
used to control the digital control lines to the attenuators. In the current
implementation, a PC's parallel port, usually used to drive a printer, is attached to
the VMX through appropriate buffering and decoding. Each attenuator (D1
through D4) may be controlled by the PC independently of all others. Software,
running on the PC, can thus control the amount (volume) of audio that reaches
the outputs and can control to what degree the two inputs are mixed in the
outputs.